Abdominal wheel



FIG. 1 is a perspective view of an abdominal wheel, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the abdominal wheel that form no part of the claimed design. 

CLAIM The ornamental design for an abdominal wheel, as shown and described. 